feat(conduit): Refactor matrix appservices and add matrix-hookshot

configuration/services/conduit/matrix-hookshot.nix

@@ -0,0 +1,144 @@
+{
+  pkgs,
+  lib,
+  config,
+  ...
+}:
+let
+  matrixLib = pkgs.callPackage ./lib.nix { };
+
+  cfg = config.services.matrix-hookshot;
+  conduitCfg = config.services.matrix-conduit;
+
+  domain = conduitCfg.settings.global.server_name;
+
+  registration = matrixLib.writeRegistrationScript {
+    id = "matrix-hookshot";
+    url = "http://127.0.0.1:9993";
+    sender_localpart = "hookshot";
+
+    namespaces = {
+      aliases = [ ];
+      rooms = [ ];
+      users = [
+        {
+          regex = "@${cfg.settings.generic.userIdPrefix}.*:${domain}";
+          exclusive = true;
+        }
+      ];
+    };
+
+    # Encryption support
+    extraSettings = {
+      "de.sorunome.msc2409.push_ephemeral" = true;
+      push_ephemeral = true;
+      "org.matrix.msc3202" = true;
+    };
+
+    runtimeRegistration = "${cfg.registrationFile}";
+  };
+in
+{
+  systemd.services.matrix-hookshot = {
+    serviceConfig = {
+      Type = lib.mkForce "exec";
+
+      LoadCredential = "matrix-hookshot:/run/secrets/matrix-hookshot";
+      inherit (registration) ExecStartPre;
+
+      # Some library in matrix-hookshot wants a home directory
+      Environment = [ "HOME=/run/matrix-hookshot" ];
+
+      DynamicUser = true;
+      StateDirectory = "matrix-hookshot";
+      RuntimeDirectory = "matrix-hookshot";
+      RuntimeDirectoryMode = "0700";
+
+      RestrictNamespaces = true;
+      PrivateUsers = true;
+      ProtectHostname = true;
+      ProtectClock = true;
+      ProtectKernelTunables = true;
+      ProtectKernelModules = true;
+      ProtectKernelLogs = true;
+      ProtectControlGroups = true;
+      RestrictAddressFamilies = [ "AF_INET AF_INET6" ];
+      LockPersonality = true;
+      RestrictRealtime = true;
+      ProtectProc = "invisible";
+      ProcSubset = "pid";
+      UMask = 77;
+    };
+  };
+
+  services.matrix-hookshot = {
+    enable = true;
+
+    serviceDependencies = [
+      "conduit.service"
+    ];
+
+    registrationFile = "/run/matrix-hookshot/registration.yaml";
+
+    settings = {
+      bridge = {
+        inherit domain;
+        url = "http://localhost:${toString conduitCfg.settings.global.port}";
+        mediaUrl = conduitCfg.settings.global.well_known.client;
+        port = 9993;
+        bindAddress = "127.0.0.1";
+      };
+
+      bot.displayname = "Hookshot";
+
+      generic = {
+        enabled = true;
+        outbound = false;
+        # Only allow webhooks from localhost for the moment
+        urlPrefix = "http://127.0.0.1:9000/webhook";
+        userIdPrefix = "_webhooks_";
+        allowJsTransformationFunctions = true;
+      };
+
+      encryption.storagePath = "/var/lib/matrix-hookshot/cryptostore";
+
+      permissions = [
+        {
+          actor = "matrix.tlater.net";
+          services = [
+            {
+              service = "*";
+              level = "notifications";
+            }
+          ];
+        }
+        {
+          actor = "@tlater:matrix.tlater.net";
+          services = [
+            {
+              service = "*";
+              level = "admin";
+            }
+          ];
+        }
+      ];
+
+      listeners = [
+        {
+          port = 9000;
+          resources = [
+            "webhooks"
+          ];
+        }
+        {
+          port = 9001;
+          resources = [
+            "metrics"
+          ];
+        }
+      ];
+
+      metrics.enable = true;
+    };
+  };
+}